Selena Gomez

CAUSE: As a UNICEF ambassador, Selena promotes clean and safe drinking water through the Tap Project. She has used Twitter as a platform to get her fans involved and asked them to support the mission by donating $1 or more for the tap water that they would normally enjoy for free. The Tap Project has raised nearly $3 million since its inception and helped save children from waterborne illnesses.

GET INVOLVED: Host a fundraising event, encourage local restaurants to participate in the project, or donate to the organization.

Photo: PR Photos

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Ian Somerhalder

CAUSE:The Vampire Diaries actor created the Ian Somerhalder Foundation to empower and educate people about energy, animals, and the habitat. The organization funds global conservation productions, promotes awareness about deforestation and animal cruelty, and mobilizes youth to support the environment.

GET INVOLVED:Purchase clothing or other gear that will benefit the foundation or make a direct donation.

Photo: PR Photos

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Miranda Kerr

CAUSE: As Earth Hour’s global ambassador, Miranda promotes the global environmental initiative to encourage the public to turn off the lights for one specified hour. Miranda created the "I Will If You Will" challenge and helped Earth Hour’s campaign reach close to 2 billion people in 135 countries. The model also founded an organic skincare line, Kora.

GET INVOLVED: Become an Earth Hour organizer or join Miranda’s "I Will If You Will" campaign by creating a YouTube video about what you are willing to do to save the planet.

GET INVOLVED:Volunteer with Reverb; tasks include handing out Ben & Jerry’s ice cream to concertgoers!

Photo: Getty Images

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Jessica Alba

CAUSE: The actress and mother co-founded The Honest Company, an organization that delivers all-natural, plant-based baby diapers and non-toxic household cleaning products to families. The company supports the environment by using organic materials that are 100 percent renewable or recyclable. Jessica is also associated with Habitat for Humanity and other leading environmental groups.

GET INVOLVED: Volunteer for Baby2Baby, The Honest Company’s nonprofit partner that gives essential baby gear and clothing to Los Angeles families in need.

Photo: Getty Images

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Adrian Grenier

CAUSE: The Entourage actor co-founded the website SHFT, a multi-media platform that promotes sustainability through design, art, video, and culture. The website enables people to read, watch, and shop all things eco-friendly and aims to make consumers more environmentally conscious in their lifestyle choices.

GET INVOLVED:Register to join SHFT and promote the environmental stories and products on social media.

Photo: PR Photos

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Gisele Bundchen

CAUSES: The Brazilian supermodel serves as United Nations goodwill ambassador for the UN Environment Program, and won International Green Celeb of the Year at the Green Awards in London last year. Her activism began when she spent time with an Indian tribe in the Amazon rainforest and became aware of the prevalent issues of water pollution and deforestation. She launched the Clean Water Project in her hometown of Horizontina, which promotes the micro basin water harvesting structures in the region and the planting of native trees.

GET INVOLVED: Learn about the UN’s Environment for Development program and help promote World Environment Day on June 5.

Photo: PR Photos

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Adam Levine

CAUSES: Adam Levine and his fellow Maroon 5 band members have pledged their support to Global Cool, an interactive website that fights global warming by motivating people to reduce their energy usage. He is a founding member of Reverb’s Green Music Group, an environmental coalition of musicians that promotes awareness by magnifying the work of national non-profit organizations and facilitating eco-friendly projects in the music industry.

GET INVOLVED:Contribute a story, photo, video, or tip on green living to Global Cool. Take Green Music Group’s Do One Thing pledge or make a direct donation to the organization.

Photo: PR Photos

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Leonardo DiCaprio

CAUSE: The actor started his own environmental organization, the Leonardo DiCaprio Foundation, to address a wide range of issues including wildlife protection, renewable energy, wildlife protection, and climate change. The foundation provides grants to sustainability projects, partners with like-minded organizations such as National Geographic Kids, and spearheads media campaigns to educate the public about going green, and its most recent project is the Save Tigers Now campaign. Leonardo serves on the boards of several other environmental organizations, including Global Green USA and the World Wildlife Fund.

GET INVOLVED: Support companies that implement sustainable practices or donate money to help save tigers in the wild.

Photo: PR Photos

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Ashley Benson

CAUSE: The Pretty Little Liars actress supports Oceana, an international organization that works to protect the world’s oceans. She recently organized an art contest to help raise awareness about sea turtle nesting.

GET INVOLVED: Become a "Wavemaker" volunteer, attend an Oceana event, or make a donation.

Photo: PR Photos

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Hayden Panettiere

CAUSE: As a campaign spokesperson for Save the Whales Again, Hayden aims to put an end to illegal whaling. A warrant was put out for her arrest in southwestern Japan when she protested to stop local fisherman from killing whales!

GET INVOLVED:Write a letter to your local senator or representative encouraging them to address this issue, or "adopt" a Taiji dolphin to raise funds.

Photo: PR Photos

My Life

11 Celebrities Who Support Eco Causes

As Earth Day approaches on April 22, take cue from these environmentally conscious stars and get involved with an organization that gives back to the planet.